Mila Kunis got her breakout role in 'That 70s Show' at the age of sixteen, which she had to lie about and say she was 18 just to get it. That type of bravado shows that she either had enough experience even at that age to know how to work the situation, or it means she's a total psycho. Considering that she acted alongside Angelina Jolie at the age of 11 in the movie 'Gia', it's clear to see which one is true.
She plays the young version of Angelina Jolie's Gia, which makes total sense given their similar eyes. That's a lot of pressure for an eleven year old but obviously it worked out now that she's a huge star. She even has the biggest prize in all of Hollywood: Ashton Kutcher.